Mitsubishi Lancer Evolution 7. Manual — part 15
POWER TRAIN - ACD and AYC
2-13
COMPONENT VIEW
Hydraulic unit
assembly
ACD mode indicator lamp
Steering
wheel sensor
Lateral G sensor
Reserve tank
Wheel speed sensor
Longitudinal
G sensor
ABS-ECU
4WD-ECU
Wheel speed sensor
Throttle position sensor (TPS)
Engine-ECU
Parking brake switch
ACD mode switch
Stop lamp switch
ACD transfer
AYC torque transfer
differential
POWER TRAIN - ACD and AYC
2-14
LIST OF MAIN COMPONENTS
Components
Outline of function
ACD transfer
Controls the transmission torque of the hydraulic multi plate clutch by the
hydraulic unit, and adjusts the center differential.
4WD-ECU
Processes information of various sensors and switches, calculates the hydraulic
multi plate clutch transmission torque and amount of AYC torque movement and
direction, and controls the hydraulic unit on the basis of them.
Engine-ECU
Sends the engine idling state to the 4WD-ECU.
ABS-ECU
Outputs the ABS monitor signal to the 4WD-ECU.
Throttle position sensor (TPS)
Sends the throttle valve opening angle to the 4WD-ECU.
Longitudinal G sensor
Sends the acceleration in the front and rear directions of the vehicle to the
4WD-ECU.
Lateral G sensor
Sends the acceleration along the side of the vehicle to the 4WD-ECU.
Steering wheel sensor
Sends the steering angle and neutral position to the 4WD-ECU.
Wheel speed sensor
Sends the wheel speed to the 4WD-ECU.
Stop lamp switch
Sends the brake operating state to the 4WD-ECU.
Parking brake switch
Sends the operating state of the parking brake to the 4WD-ECU.
ACD mode indicator lamp
Displays the ACD control mode (TARMAC, GRAVEL, SNOW).
p
Lights the all mode lamp during fail. (Lights for about 1.5 seconds after the ignition
switch is turned ON)
ACD mode switch
Switches the ACD control mode (TARMAC, GRAVEL, SNOW).
Hydraulic
it
Pressure sensor
Sends the pressure of the accumulator to the 4WD-ECU.
y
unit
Electric pump
Generates oil pressure for clutch operations.
Directional valve
Controls whether to supply the oil pressure to the left or right AYC clutch.
Proportional valve
<ACD>
Controls hydraulic supplied to hydraulic multi plate clutch of the ACD.
Proportional valve
<AYC>
Controls oil pressure supplied to the AYC clutch.
Electric pump relay
Supplies the power to the electric pump.
AYC torque transfer differential
Controls the transmission torque of the left and right clutches according to the
oil pressure from the hydraulic unit, and adjusts the left and right driving power
difference of the rear wheels.
POWER TRAIN - ACD and AYC
2-15
OUTLINE OF ACD AND AYC
Diagnostic connector
Engine-ECU
ACD mode switch
Idling information
Parking brake switch
ACD mode indicator lamp
ABS-
ECU
ABS monitor signal
Wheel speed sensor <FL>
Wheel speed sensor <RL>
Wheel speed sensor <RR>
Wheel speed sensor <FR>
Wheel speed sensor <FL>*
1
Wheel speed sensor <RL>*
1
Wheel speed sensor <RR>*
1
Wheel speed sensor <FR>*
1
Longitudinal G sensor
Lateral G sensor
Stop lamp
Steering wheel sensor
Pressure sensor
Throttle position sensor
ECU power supply
4WD-ECU
Direction valve*
2
Proportional valve*
2
(AYC)
Steering wheel sensor
Stop lamp switch
ACD transfer
Center
differential
Lateral G sensor
Longitudinal G sensor
AYC torque transfer
differential *
2
Hydraulic
multi
plate clutch
Right clutch*
2
Left clutch*
2
Wheel speed sensor <RL>
Wheel speed sensor <FL>
Wheel speed
sensor <FR>
Wheel speed sensor <RR>
Proportional
valve*
2
(AYC)
Directional
valve*
2
Pressure
sensor
Electric
pump
Reservoir
tank relay
<ACD and AYC
Equipped Vehicle>
Hydraulic unit
Accu-
mulator
Electric
pump
Proportional
valve
(ACD)
Proportional valve (ACD)
NOTE
1.
*
1
indicates equipped with only ACD.
2.
*
2
indicates equipped with ACD and AYC.
POWER TRAIN - ACD and AYC
2-16
DESCRIPTION OF STRUCTURE AND OPERATIONS
The ACD system adopts a transfer limited slip differential as the hydraulic multi plate clutch, and electronically
controls it using sensors, 4WD-ECU, and hydraulic unit.
NOTE
Refer to P.2-30 for details on the AYC structure and operations.
SYSTEM STRUCTURE
Wheel speed sensor
Longitudinal G sensor
Lateral G sensor
Steering wheel sensor
Sensors
(Electric pump with
accumulator)
Hydraulic unit
4WD-ECU
ACD transfer
Engine
T/M
TPS
AYC torque transfer
differential
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